Larsen & Toubro Limited Java Developer Interview Questions and Answers

Spring Boot is a framework that simplifies the development of Java applications by providing pre-configured templates and dependencies.

• Spring Boot uses an embedded server to run the application

• It provides auto-configuration of dependencies

• It uses annotations to configure the application

• It supports various data sources and web frameworks

• It simplifies the deployment process

Errors are unrecoverable, while exceptions can be handled.

• Errors are caused by the environment or JVM, while exceptions are caused by the application code.

• Errors cannot be handled, while exceptions can be caught and handled using try-catch blocks.

• Examples of errors include OutOfMemoryError and StackOverflowError, while examples of exceptions include NullPointerException and ArrayIndexOutOfBoundsException.

Spring framework was used extensively in the project for dependency injection and MVC architecture.

• Used Spring Boot for easy setup and configuration

• Implemented Spring Security for authentication and authorization

• Utilized Spring Data JPA for database operations

• Used Spring MVC for handling HTTP requests and responses

• Implemented Spring AOP for logging and exception handling

SQL joins are used to combine data from two or more tables based on a related column.

• Inner join returns only the matching rows from both tables

• Left join returns all rows from the left table and matching rows from the right table

• Right join returns all rows from the right table and matching rows from the left table

• Full outer join returns all rows from both tables

• Cross join returns the Cartesian product of both table...read more

Connection pool can be created using libraries like Apache DBCP or HikariCP.

• Choose a connection pool library based on your requirements.

• Configure the pool size, maximum connections, and other settings.

• Create a data source object and set the connection pool properties.

• Use the data source object to get connections from the pool.

• Close the connections after use to return them to the pool.

Java and related technologies enable robust web applications, focusing on backend and frontend development.

• Java: A versatile, object-oriented programming language used for building platform-independent applications.

• Spring Boot: A framework that simplifies Java application development by providing pre-configured templates and components.

• Hibernate: An ORM (Object-Relational Mapping) tool for Java that simplifies dat...read more